Mark Zuckerberg wants to get a billion people in “meaningful” Facebook groups. But to get there he’ll have to battle the spammers, hackers, and trolls who exploit and hijack groups to make money or sow chaos.

A DC-based group called "Progressives For Immigration Reform" has posted ads across San Francisco that say a foreign-born tech workforce has made US workers seem “expensive, undeserving, and expendable.”

Theranos, led by CEO and founder Elizabeth Holmes, raised more than $700 million on the promise of a revolutionary blood-testing technology that never materialized. The Securities and Exchange Commission just charged Holmes with “massive fraud.”

Copying other companies' work and intellectual property can generate big paydays for hucksters in the cryptocurrency world. One company has maintained a $2.3 billion valuation despite widespread allegations of plagiarism.